Add RemotePathService for manipulating paths from a different OS, for #82739

Also fix opening an absolute path in quickopen, cross OS

src/vs/workbench/services/path/common/remotePathService.ts

@@ -0,0 +1,81 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as path from 'vs/base/common/path';
+import * as platform from 'vs/base/common/platform';
+import { URI } from 'vs/base/common/uri';
+import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
+import { createDecorator } from 'vs/platform/instantiation/common/instantiation';
+import { IRemoteAgentService } from 'vs/workbench/services/remote/common/remoteAgentService';
+
+const REMOTE_PATH_SERVICE_ID = 'remotePath';
+export const IRemotePathService = createDecorator<IRemotePathService>(REMOTE_PATH_SERVICE_ID);
+
+export interface IRemotePathService {
+	_serviceBrand: undefined;
+
+	path: Promise<path.IPath>;
+	fileURI(path: string): Promise<URI>;
+}
+
+/**
+ * Provides the correct IPath implementation for dealing with paths that refer to locations in the extension host
+ */
+export class RemotePathService implements IRemotePathService {
+	_serviceBrand: undefined;
+
+	private _extHostOS: Promise<platform.OperatingSystem>;
+
+	constructor(
+		@IRemoteAgentService readonly remoteAgentService: IRemoteAgentService
+	) {
+		this._extHostOS = remoteAgentService.getEnvironment().then(remoteEnvironment => {
+			return remoteEnvironment ? remoteEnvironment.os : platform.OS;
+		});
+	}
+
+	get path(): Promise<path.IPath> {
+		return this._extHostOS.then(os => {
+			return os === platform.OperatingSystem.Windows ?
+				path.win32 :
+				path.posix;
+		});
+	}
+
+	async fileURI(_path: string): Promise<URI> {
+		let authority = '';
+
+		// normalize to fwd-slashes on windows,
+		// on other systems bwd-slashes are valid
+		// filename character, eg /f\oo/ba\r.txt
+		if ((await this._extHostOS) === platform.OperatingSystem.Windows) {
+			_path = _path.replace(/\\/g, '/');
+		}
+
+		// check for authority as used in UNC shares
+		// or use the path as given
+		if (_path[0] === '/' && _path[1] === '/') {
+			const idx = _path.indexOf('/', 2);
+			if (idx === -1) {
+				authority = _path.substring(2);
+				_path = '/';
+			} else {
+				authority = _path.substring(2, idx);
+				_path = _path.substring(idx) || '/';
+			}
+		}
+
+		// return new _URI('file', authority, path, '', '');
+		return URI.from({
+			scheme: 'file',
+			authority,
+			path: _path,
+			query: '',
+			fragment: ''
+		});
+	}
+}
+
+registerSingleton(IRemotePathService, RemotePathService, true);